Publications

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Hafner, S. D. & Astals, S. (2019). Systematic error in manometric measurement of biochemical methane potential: Sources and solutions. Waste Management, 91, 147-155. https://doi.org/10.1016/j.wasman.2019.05.001

Justesen, C. G., Astals, S., Mortensen, J. R., Thorsen, R., Koch, K., Weinrich, S., Triolo, J. M. & Hafner, S. D. (2019). Development and Validation of a Low-Cost Gas Density Method for Measuring Biochemical Methane Potential (BMP). Water, 11(12), Artikel 2431. https://doi.org/10.3390/w11122431

Koch, K., Hafner, S. D., Weinrich, S. & Astals, S. (2019). Identification of Critical Problems in Biochemical Methane Potential (BMP) Tests From Methane Production Curves. Frontiers in Environmental Science, 7, Artikel 178. https://doi.org/10.3389/fenvs.2019.00178

Sommer, S. G., Webb, J. & Hutchings, N. (2019). New Emission Factors for Calculation of Ammonia Volatilization From European Livestock Manure Management Systems. Frontiers in Sustainable Food Systems, 3, Artikel 101. https://doi.org/10.3389/fsufs.2019.00101

Wijesinghe, D. T. N., Dassanayake, K. B., Sommer, S. G., Scales, P. J. & Chen, D. (2019). Biogas improvement by adding Australian zeolite during the anaerobic digestion of C: N ratio adjusted swine manure. Waste and Biomass Valorization, 10(7), 1883-1887. https://doi.org/10.1007/s12649-018-0210-4

Clough, T. J., Balaine, N., Cameron, K. C., Petersen, S. O. & Sommer, S. G. (2018). Effects of dairy shed effluent dry matter content on ammonia and nitrous oxide emissions from a pasture soil. Journal of Agricultural Science, 156(9), 1070-1078. https://doi.org/10.1017/S0021859618001028

Hafner, S. D., Madsen, J. T., Pedersen, J. M. & Rennuit, C. (2018). Inter-stage thermophilic aerobic digestion may increase organic matter removal from wastewater sludge without decreasing biogas production. Water Science and Technology, 77(3), 721-726. https://doi.org/10.2166/wst.2017.590

Hafner, S. D., Rennuit, C., J. Olsen, P. & Pedersen, J. M. (2018). Quantification of leakage in batch biogas assays. Water Practice and Technology, 13(1), 52-61. https://doi.org/10.2166/wpt.2018.012

Hafner, S. D., Koch, K., Carrère, H., Astals, S., Weinrich, S. & Rennuit, C. (2018). Software for biogas research: Tools for measurement and prediction of methane production. SoftwareX, 7, 205-210. https://doi.org/10.1016/j.softx.2018.06.005

Hafner, S. D., Pacholski, A., Bittman, S., Burchill, W., Bussink, W., Chantigny, M., Carozzi, M., Genermont, S., Häni, C., Hansen, M. N., Huijsman, J., Hunt, D., Kupper, T., Lanigan, G., Loubet, B., Misselbrook, T. H., Meisinger, J. J., Neftel, A., Nyord, T. ... Sommer, S. G. (2018). The ALFAM2 database on ammonia emission from field-applied manure: Description and illustrative analysis. Agricultural and Forest Meteorology, 258, 66-79. https://doi.org/10.1016/j.agrformet.2017.11.027

Hafner, S. D., Bühler, M., Feilberg, A., Franco, R. B., Howard, C., Montes, F., Muck, R. E., Rotz, C. A. & Weiss, K. (2018). Volatile organic compounds and silage: sources, emission, and mitigation. I Proceedings of the XVIII International Silage Conference (s. 52-68). Universität Bonn. https://www.isc2018.de/Download/Proceedings

Kure, J. L., Krabben, J., Pedersen, S. V., Carozzi, M. & Sommer, S. G. (2018). An Assessment of Low-Cost Techniques to Measure Ammonia Emission from Multi-Plots: A Case Study with Urea Fertilization. Agronomy, 8(11), Artikel 245. https://doi.org/10.3390/agronomy8110245

Nyord, T., Kai, P. & Sommer, S. G., (2018). Praktiske udfordringer ved indførsel af gyllenedfældnings- og gylleforsuringspåbud i Danmark, Nr. 2018-760-000860, 15 s., okt. 05, 2018.

Pedersen, S. V., di Perta, E. S., Hafner, S. D., Pacholski, A. S. & Sommer, S. G. (2018). Evaluation of a Simple, Small-Plot Meteorological Technique for Measurement of Ammonia Emission: Feasibility, Costs, and Recommendations. Transactions of the ASABE, 61(1), 103-115. https://doi.org/10.13031/trans.12445

Rennuit, C., Triolo, J. M., Eriksen, S., Jimenez, J., Carrère, H. & Hafner, S. D. (2018). Comparison of pre- and inter-stage aerobic treatment of wastewater sludge: Effects on biogas production and COD removal. Bioresource Technology, 247, 332-339. https://doi.org/10.1016/j.biortech.2017.08.128

Sommer, S. G. (2018). Effect of hydraulic retention times (HRTs) on mesophilic anaerobic digestion of swine manure. Sustainable Environment Research.

Wijesinghe, D. T. N., Dassanayake, K. B., Scales, P. J., Sommer, S. G. & Chen, D. (2018). Effect of Australian zeolite on methane production and ammonium removal during anaerobic digestion of swine manure. Journal of Environmental Chemical Engineering, 6(1), 1233-1241. https://doi.org/10.1016/j.jece.2018.01.028

Wijesinghe, D. T. N., Dassanayake, K. B., Scales, P., Sommer, S. G. & Chen, D. (2018). Removal of excess nutrients by Australian zeolite during anaerobic digestion of swine manure. Journal of Environmental Science and Health. Part A: Toxic Hazardous Substances and Environmental Engineering, 53(4), 362-372. https://doi.org/10.1080/10934529.2017.1401398

Bonifacio, H. F., Rotz, C. A., Hafner, S. D., Montes, F., Cohen, M. & Mitloehner, F. M. (2017). A process-based emission model of volatile organic compounds from silage sources on farms. Atmospheric Environment, 152, 85-97. https://doi.org/10.1016/j.atmosenv.2016.12.024

Hafner, S. D., Sommer, S. G., Petersen, V. & Markfoged, R. (2017). Effects of carbon dioxide hydration kinetics and evaporative convection on pH profile development during interfacial mass transfer of ammonia and carbon dioxide. Heat and Mass Transfer, 53(4), 1335-1342. https://doi.org/10.1007/s00231-016-1910-6

Pilar Bernal, M., Sommer, S. G., Chadwick, D., Qing, C., Guoxue, L. & Michel Jr., F. C. (2017). Current Approaches and Future Trends in Compost Quality Criteria for Agronomic, Environmental, and Human Health Benefits. Advances in Agronomy, 144, 143-233. https://doi.org/10.1016/bs.agron.2017.03.002

Sommer, S. G. (2017). Biogas production from steer manures in Vietnam: Effects of feed supplements and tannin contents. Waste Management, 69, 492-497. https://doi.org/10.1016/j.wasman.2017.08.002

Sommer, S. G. (2017). Industrial wastewater for biogas production: Use of tannery wastewater as an alternative substrate and a pre-treatment medium.

Sommer, S. G., Clough, T. J., Balaine, N., Hafner, S. D. & Cameron, K. C. (2017). Transformation of organic matter and the emissions of methane and ammonia during storage of liquid manure as affected by acidification. Journal of Environmental Quality, 46(3), 514-521. https://doi.org/10.2134/jeq2016.10.0409

Hafner, S., Pedersen, S. V. & Sommer, S. G. (2016). The ALFAM2 project: Predicting ammonia loss from field-applied manure. I 16th International Conference on Rural-Urban Symbiosis (s. 289-292)

Katz, J., Hafner, S. D. & Donovan, T. (2016). Assessment of Error Rates in Acoustic Monitoring with the R package monitoR. Bioacoustics - the International Journal of Animal Sound and its Recording, 25(2), 177-196. https://doi.org/10.1080/09524622.2015.1133320

Katz, J., Hafner, S. D. & Donovan, T. (2016). Tools for automated acoustic monitoring within the R package monitoR. Bioacoustics - the International Journal of Animal Sound and its Recording, 25(2), 197-210.

Pedersen, S. V., Marti-Herrero, J., Singh, A. K., Sommer, S. G. & Hafner, S. (2016). A new software tool for predicting methane emission from manure storage facilities. I International Conference on Agricultural Engineering https://www.researchgate.net/publication/319133598_A_new_software_tool_for_predicting_methane_emission_from_manure_storage_facilities

Pedersen, S. V., Marti-Herrero, J., Sommer, S. G. & Hafner, S. (2016). Evaluation of a Simple Heat Transfer-and Biogas Production Model for Anaerobic Digesters of Various Designs. I 24th European Biomass Conference Exhibition

Petersen, S. O., Hutchings, N. J., Hafner, S. D., Sommer, S. G., Hjorth, M. & Jonassen, K. (2016). Ammonia abatement by slurry acidification: A pilot-scale study of three finishing pig production periods. Agriculture, Ecosystems & Environment, 216, 258-268. https://doi.org/10.1016/j.agee.2015.09.042

Petersen, S. O., Olsen, A. B., Elsgaard, L., Triolo, J. M. & Sommer, S. G. (2016). Estimation of Methane Emissions from Slurry Pits below Pig and Cattle Confinements. PLoS One, 11(8), Artikel e0160968. https://doi.org/10.1371/journal.pone.0160968

Rennuit, C. & Hafner, S. (2016). Interstage treatment for increasing methane production from recalcitrant biomass. I 16th International Conference on Rural-Urban Symbiosis (s. 535-538) http://ramiran2015.de/wp-content/uploads/2016/05/RAMIRAN_2015-Proceedings-Book.pdf

Sommer, S. G., Hamelin, L., Olesen, J. E., Montes, F., Jia, W., Qing, C. & Triolo, J. M. (2016). Agricultural waste biomass: Chapter 3. I E. Lakovou, D. Bochtis, D. Vlachos & D. Aidonis (red.), Supply Chain Management for Sustainable Food Networks John Wiley & Sons.

Sommer, S. G. (2016). A review of ammonia emission measured using wind tunnels compared with micrometeorological techniques. Soil Use and Management, 32(Suppl 1), 101-108. https://doi.org/10.1111/sum.12209

Sommer, S. G. (2016). Influence of freezing/thawing and drying/milling on Biochemical Methane Potential. Environmental Engineering and Management Journal, 15(7), 1533-1536. http://www.ecozone.ro/reviste.php?revista=21&volum=60&numar=182&RID=27079

Sommer, S. G. (2016). The importance of pH for ammonia emission from animal manure. I I. Körner (red.), RAMIRAN 2015: Proceeding of the 16th International Conference Rural-Urban Symbiosis (s. 297-300). TuTech Verlag . http://ramiran2015.de/wp-content/uploads/2016/05/RAMIRAN_2015-Proceedings-Book.pdf

Vazifehkhoran, A. H., Triolo, J. M., Larsen, S. U., Stefanek, K. & Sommer, S. G. (2016). Assessment of the variability of biogas production from sugar beet silage as affected by movement and loss of the produced alcohols and organic acids. Energies, 9(5). https://doi.org/10.3390/en9050368

Wijesinghe, D. T. N., Dassanayake, K. B., Sommer, S. G., Jayasinghe, G. Y., J. Scales, P. & Chen, D. (2016). Ammonium removal from high-strength aqueous solutions by Australian zeolite. Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering, 51(8), 614-625. https://doi.org/10.1080/10934529.2016.1159861

Bernal, M. P., Sommer, S. G. & Chadwick, D. (2015). Compost quality criteria for safe and sustainable agriculture. I the International Composting Conference

Hafner, S. D., Windle, M., Merrill, C., Smith, M. L., Franco, R. B. & Kung, L. (2015). Effects of potassium sorbate and Lactobacillus plantarum MTD1 on production of ethanol and other volatile organic compounds in corn silage. Animal Feed Science and Technology, 208, 79-85. https://doi.org/10.1016/j.anifeedsci.2015.07.007

Hafner, S. D., Pedersen, S. V., Sommer, S. G. & Pacolski, A. (2015). Predicting ammonia loss from field-applied manure - The ALFAM2 project. I I. Körner (red.), Proceedings of the 16th International RAMIRAN Conference TuTech Verlag .

Hafner, S. D., Rennuit, C., Triolo, J. M. & Richards, B. K. (2015). Validation of a simple gravimetric method for measuring biogas production in laboratory experiments. Biomass and Bioenergy, 83, 297-301. https://doi.org/10.1016/j.biombioe.2015.10.003

Loyon, L., Burton, C. H., Misselbrook, T. H., Webb, J., Philippe, F. X., Aguilar, M., Doreau, M., Hassouna, M., Veldkamp, T., Dourmad, J. Y., Bonmati, A., Grimm, E. & Sommer, S. G. (2015). Best available technology for European livestock farms: Availability, effectiveness and uptake. Journal of Environmental Management, 166, 1-11. https://doi.org/10.1016/j.jenvman.2015.09.046

Sommer, S. G., Hamelin, L., Olesen, J. E., Montes, F., Wei, J., Qing, C. & Triolo, J. M. (2015). Agricultural waste biomass. I E. Lakovou, D. Bochtis, D. Vlachos & D. Aidonis (red.), Supply Chain Management for Sustainable Food Networks (s. 67-98). John Wiley & Sons. https://doi.org/10.1002/9781118937495

Sommer, S. G., Hamelin, L., Olesen, J. E., Montes, F., Jia, W., Chen, Q. & Triolo, J. M. (2015). Agricultural waste biomass. I Supply Chain Management for Sustainable Food Networks (s. 67-106). Wiley. https://doi.org/10.1002/9781118937495.ch3

Sommer, S. G. (2015). Biogas Production from Vietnamese Animal Manure, Plant Residues and Organic Waste: Influence of Biomass Composition on Methane Yield. Asian-Australasian Journal of Animal Sciences, 28(2), 280-289. https://doi.org/10.5713/ajas.14.0312.

Sommer, S. G. (2015). Biogas production within the bioethanol production chain: use of co-substrates for anaerobic digestion of sugar beet vinasse. Bioresource Technology, 190, 227–234.

Sommer, S. G. (2015). Comprehensive microbial analysis of combined mesophilic anaerobic-thermophilic aerobic process treating high-strength food wastewater. Water Research, 73, 291-303. https://doi.org/10.1016/j.watres.2015.01.038

Sommer, S. G. (2015). Measurements of ammonia emission from grazing animals. Abstract fra Methods for estimating ammonia losses from organic pig production in free range systems and in barns with outdoor pens, Hovborg , Danmark.

Sommer, S. G. (2015). New tool for improving management of biogas digesters: A heat transfer- and biogas production model for anaerobic digestion. I I. Körner (red.), RAMIRAN 2015 - 16th International Conference Rural-Urban Symbiosis: Abstract Book (s. 140). Artikel TD-O_12 TuTech Innovation.

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Revideret 18.03.2026

Sasha D. Hafner